Unit type	Specification						Unit version	Model
Unit type	Number of safety output points	Internal I/O common	Maximum load current	Rated voltage	Number of safety slave con- nections	I/O re- freshing method	Unit version	Model
Safety Output Units	2 points	Sourcing outputs (PNP)	2.0 A/point, 4.0 A/Unit at 40°C, and 2.5 A/ Unit at 55°C The maximum load current depends on the installation orientation and ambient temperature.	24 VDC	1	Free-Run refreshing	Ver. 1.0	NX-SOH200
Safety Output Units	4 points	Sourcing outputs (PNP)	0.5 A/point and 2.0 A/Unit	24 VDC	1	Free-Run refreshing	Ver. 1.0	NX-SOD400

Regulations and Standards

Safety I/O Units NX-SI/SO

Certification body	Standards
*TÜV Rheinland 1**	• EN ISO 13849-1 • EN ISO 13849-2 • IEC 61508 parts 1-7 • IEC/EN 62061 • IEC/EN 61131-2 • IEC 61326-3-1
UL	• NRAG (UL 508 and ANSI/ISA 12.12.01) • NRAG7 (CSA C22.2 No. 142 and CSA C22.2 No. 213)
Shipbuilding Standards	NK, LK

*1 Using the NX-series Safety I/O Units in conjunction with the NX-series Safety CPU Unit allows you to build a safety control
system that meets the following standards:
• Requirements for SIL 3 in IEC 61508 and IEC/EN 62061
• Requirements for PLe and Safety Category 4 in EN ISO 13849-1
The NX-series Safety I/O Units are also registered for RCM, EAC, and KC compliance.

General Specifications

Item		Specification
Enclosure		Mounted in a panel (open)
Grounding method		Ground to 100 Ω or less.
Operating environment	Ambient operating temperature	0 to 55°C (The upper limit of the ambient operating temperature is restricted by the installation orientation.)
	Ambient operating humidity	10% to 95% (with no condensation or icing)
	Atmosphere	Must be free from corrosive gases.
	Ambient storage temperature	-25 to 70°C (with no condensation or icing)
	Altitude	2,000 m max.
	Pollution degree	2 or less.
	Noise immunity	Conforms to IEC 61131-2. 2 kV on power supply line (Conforms to IEC 61000-4-4.)
	Insulation class	Class III (SELV)
	Overvoltage category	II
	EMC immunity level	Zone B
	Vibration resistance	Conforms to IEC 60068-2-6. 5 to 8.4 Hz with 3.5-mm amplitude, 8.4 to 150 Hz, acceleration of 9.8 m/s², 100 minutes each in X, Y, and Z directions (10 sweeps of 10 min each = 100 min total)
	Shock resistance	Conforms to IEC 60068-2-27. 147 m/s², 3 times each in X, Y, and Z directions
	Insulation resistance	20 MΩ between isolated circuits (at 100 VDC)
	Dielectric strength	510 VAC for 1 min between isolated circuits, leakage current: 5 mA max.
Installation method		DIN Track (IEC 60715 TH35-7.5/TH35-15)

Safety Output Units NX-SOH200/SOD400

Unit name	Safety Output Unit
Model	NX-SOH200	NX-SOD400
Number of safety output points	2 points	4 points
Internal I/O common	PNP (sourcing outputs)
Maximum load current	2.0 A/point 4.0 A/Unit at 40°C 2.5 A/Unit at 55°C The maximum load current depends on the installation orientation and ambient temperature. See Installation orientation and restrictions.	0.5 A/point and 2.0 A/Unit
Rated voltage	24 VDC (20.4 to 28.8 VDC)
Number of safety slave connections	1
I/O refreshing method	Free-Run refreshing
External connection terminals	Screwless clamping terminal block (8 terminals)
Indicators
Safety output ON residual voltage	1.2 V max. (Between IOV and all output terminals)
Safety output OFF residual voltage	2 V max. (Between IOG and all output terminals)
Safety output leakage current	0.1 mA max.
Dimensions	12 × 100 × 71 mm (W × H × D)
Isolation method	Photocoupler isolation
Insulation resistance	20 MΩ min. between isolated circuits (at 100 VDC)
Dielectric strength	510 VAC for 1 min between isolated circuits, leakage current: 5 mA max.
I/O power supply method	Power supplied from the NX bus
Current capacity of I/O power supply terminals	IOG: 2 A max./terminal	IOG (A3 and B3): 2 A max./terminal IOG (A7 and B7): 0.5 A max./terminal
NX Unit power consumption	• Connected to a CPU Unit or a Communication Control Unit 1 1.05 W max. • Connected to a Communications Coupler Unit 2 0.70 W max.	• Connected to a CPU Unit or a Communication Control Unit 1 1.10 W max. • Connected to a Communications Coupler Unit 2 0.75 W max.
Current consumption from I/O power supply	40 mA max.	60 mA max.
Weight	65 g max.
Circuit layout
Terminal connection diagram	So0 and So1: Safety output terminals IOG: I/O power supply 0 V Refer to User’s manual (Cat.No.Z930) for details.	So0 to So3: Safety output terminals IOG: I/O power supply 0 V Refer to User’s manual (Cat.No.Z930) for details.
Installation orientation and restrictions	Installation orientation: • Connected to a CPU Unit or a Communication Control Unit 1 Possible in the upright installation orientation. • Connected to a Communications Coupler Unit 2 6 possible orientations Restrictions: For upright installation, the ambient temperature is restricted as shown below depending on the total Unit load current. For all installation orientations other than upright installation, the ambient temperature is restricted as shown below according to the total Unit load current.	Installation orientation: • Connected to a CPU Unit or a Communication Control Unit 1 Possible in the upright installation orientation. • Connected to a Communications Coupler Unit 2 6 possible orientations Restrictions: None
Protective functions	Overvoltage protection circuit and short detection

*1 The NX102 CPU Unit and the NX-CSG Communication Control Unit can be connected. The NX1P2 CPU Unit cannot be
connected.
*2 The NX-ECC20 EtherCAT Coupler Unit and NX-EIC202 EtherNet/IP Coupler Unit can be connected.